The cycle of colonization and extinction of tortoises
took place at least three times on Aldabra (Braithwaite
et al., 1973), whereas as far as we know Bermuda
experienced only one colonization, not only because it
is more difficult for tortoises to reach but also because
the mainland ancestral source went extinct. Probably
only the discovery of a fossil deposit of MIS 10 age on
Bermuda could resolve whether the island actually
harbored an endemic population of tortoise, but this
definitely remains a viable possibility